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1 . 空气质量指数
是反应空气质量状况的指数,
越小,表明空气质量越好.如下表:
下图是某城市5月1日~5月20日
指数变化的趋势,则下列说法正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/dd1329c2-605e-4140-9af6-edbb7160df66.png?resizew=383)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
| 0~50 | 51~100 | 101~150 | 151~200 | 201~300 | |
空气质量 | 优 | 良 | 轻度污染 | 中度污染 | 重度污染 | 严重污染 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885d73d67ae70cb0d7359974b2e5c931.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/dd1329c2-605e-4140-9af6-edbb7160df66.png?resizew=383)
A.这20天中![]() |
B.这20天中的重度污染及以上的天数占![]() |
C.该城市5月前半个月的空气质量越来越好 |
D.该城市5月上旬的空气质量比中旬的空气质量好 |
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2 . 已知函数
.
(1)若
,求函数
的极值点;
(2)若
是该函数的一个极值点,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb0bfeb4ac59a4f9eb264d8222fdcf3.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40166f970caa5948421c866d09c27970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b500c929e549dd9688ceb7876cd24e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ae63f1789cbbf6d939fdece5cac44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855699d6b7de07ce257b464219b5f3eb.png)
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3 . 已知
.
(1)当
时,解不等式
;
(2)若
的最小值为6,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a0ff5e8eabcb168afde7e32de20f8c.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b562ca77fa64f3ebe40e0ad49833d5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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4 . 已知
,函数
,且对任意的实数
,
恒成立,则
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13022bd17838b53639fb72daa0936979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 已知
,且
为偶函数,则
的值可能为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9871d38645964fb0576a6329caa6585e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec40699cb064d62bbf2ffd210a1cc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 我市准备实施天然气价格阶梯制,现提前调查市民对天然气价格阶梯制的态度,随机抽查了
名市民,现将调查情况整理成了被调查者的频率分布直方图(如图)和赞成者的频数表如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/8be9c216-1a19-43c7-b1b4-383aa83ff2c2.png?resizew=268)
(1)若从年龄在
,
的被调查者中各随机选取
人进行调查,求所选取的
人中至少有
人对天然气价格阶梯制持赞成态度的概率;
(2)若从年龄在
,
的被调查者中各随机选取
人进行调查,记选取的
人中对天然气价格实施阶梯制持不赞成态度的人数为
,求随机变量
的分布列和数学期望.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
年龄(岁) | ||||||
赞成人数 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/8be9c216-1a19-43c7-b1b4-383aa83ff2c2.png?resizew=268)
(1)若从年龄在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c64cd583c538f89bb8ad7ac2b2e136a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60387030a865e31ae81d19074ed61f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(2)若从年龄在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c64cd583c538f89bb8ad7ac2b2e136a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1518f7303c68bd06a664df4716346765.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
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7 . 已知非零实数
,则下列说法一定正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-05-27更新
|
1199次组卷
|
3卷引用:重庆市巴蜀中学2018-2019学年高一下学期期中数学试题
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8 . 如图:在平面四边形
中,已知
,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/084acb19-57e5-4c97-bfce-5be27031a2b6.png?resizew=115)
(1)求
;
(2)求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c22203380bd9ba2bd71b3f2305bf41ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0a47a796213312ebf11e2960c0f1b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/084acb19-57e5-4c97-bfce-5be27031a2b6.png?resizew=115)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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2卷引用:重庆市巴蜀中学2018-2019学年高一下学期期中数学试题
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9 . 在数列
中,已知
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f363ced87ae3253f7afdd4e9a3904e9.png)
,记
,
为数列
的前
项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da14545c3b4016fe1da93959d72e1e88.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f363ced87ae3253f7afdd4e9a3904e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30f29ac18bbd9fe243ee282bf38b522.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e19fdf15034ebd6c7ad31e691645de88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da14545c3b4016fe1da93959d72e1e88.png)
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2卷引用:重庆市巴蜀中学2018-2019学年高一下学期期中数学试题
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10 . 在
中,角
,
,
所对的边分别是
,
,
,若向量
,
,且
,则角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649063c289bd194842e519a9901a0fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691973f3b6518d32c1f0e2e0b45528d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9138d6193d51bfabab3857b2651e1518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-05-27更新
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1372次组卷
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3卷引用:重庆市巴蜀中学2018-2019学年高一下学期期中数学试题